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I'm pretty sure you don't have to invert the R410 bottle for liquid, unless the bottle says you do.

Yes you do. The blend of refrigerants evaporate at different pressures and the liquid ensures that r410a is being charged and not one of the blends. Thats what I've read and the bottle does say to charge by liquid.

But the new 410a bottles, at least some of them, have the dip tube in the bottom so liquid is always available. No I gotta go look in my van cause this is driving me nuts. I could be wrong but I could swear I don't have to invert my bottles.

"The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
- Alexis﻿ de Toqueville, 1835

When they first came out with 410, they were going to use a dip tube. They may have done it for awhile. They don't anymore.

Could very well be my answer as I'm still using some old bottles. When I get into the shop I'm going to look at all the other different color jugs cause I think there still may be one more. I think it's the dull orange one.......who remembers what they are by refrigerant numbers anymore!

"The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
- Alexis﻿ de Toqueville, 1835